CAEMI

I need a quick answer - should I use Dexron III or VI?

Diesel

III

Solomon7

They may also have Dex/Merc and not III. Same thing fyi

CAEMI

Cool. Got Dex III.

Swapped radiators out...quart or two low.

whowey

While we are on the subject... NO DEX VI....

Dex VI is special low viscosity synthetic transmission fluid that GM developed to help with the miserable MPG on their SUV/Truck line-up

CAEMI

I read the Wikipedia entry on Dex VI. It is SUPPOSED to be backward compatible with everything...but I have trusted what GM said before and lost 100% of my investment in their stock....so I bought Dex III.

I see now that the politicians get to participate in the "new" GM stock IPO. So glad they're looking out for us little people. I can hardly wait for the next problem them solve...except they'll have to make one up first.

fantic238

http://www.dieselplace.com/forum/sho...d.php?t=302701

4jeepers

Any one of above as a higher supersedes the one below. Cannot hurt your vehicle.

CAEMI

This post is a must read. It clarifies the trans oil game. I'm copying some of it for my FIL who drives an 05 Duramax with the Allison.

Thanks, FANTIC. A+ content.

whowey

It is a nice piece on the differences in the fluids.
Its a bit old on some of the particular company specifics. In fact, Amsoil does offer a differentiated product for the low viscosity specifications. Mercon LV and SP, Dex VI and the Toyota WS. But that really is not a huge issue.